class SingletonLazy {
    private static volatile SingletonLazy instance = null;
    public static SingletonLazy getInstance(){
        if(instance==null){
            synchronized (SingletonLazy.class){
                if(instance==null){
                    instance = new SingletonLazy();
                }
            }
        }
        return instance;
    }
    private SingletonLazy(){

    }
}
public class Test2 {
}
